1166889 has 4 divisors (see below), whose sum is σ = 1555856. Its totient is φ = 777924.

The previous prime is 1166861. The next prime is 1166903. The reversal of 1166889 is 9886611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1166889 - 2⁵ = 1166857 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1166839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194479 + ... + 194484.

It is an arithmetic number, because the mean of its divisors is an integer number (388964).

2^1166889 is an apocalyptic number.

It is an amenable number.

1166889 is a deficient number, since it is larger than the sum of its proper divisors (388967).

1166889 is an equidigital number, since it uses as much as digits as its factorization.

1166889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388966.

The product of its digits is 20736, while the sum is 39.

The square root of 1166889 is about 1080.2263651661. The cubic root of 1166889 is about 105.2793468566.

The spelling of 1166889 in words is "one million, one hundred sixty-six thousand, eight hundred eighty-nine".